A movie of the 3D-Printed STL file of Clark model # 39 - Reverse Motion, prepared by Laura DeForest. Printed model size: 25 x 25 x 12 cm. Model contains gaps of 0.5mm between moving surfaces, release gaps, and added features for strength. This model was tested on a Stratasys FDM3000 rapid prototyping machine. The CAD model used to generate this STL file is also available in this database.